unfortunately -|- It is unfortunate if you get rid of the -e in this word when you add the -ly. 

ukulele -|- Ukuleles Keep Us Lively, Enthralled Listeners Entertained. 

unanimous -|- This is another word that helps to learn the origin. Un means one and animus means mind & heart. One mind & heart. Keep the un- and the anim- and add the –ous.  

usage -|- Your electric bill shows the usage of your wattage.  

undoubtedly -|- This word is spelled how it sounds except for that pesky silent –b. So, remember the –b and add an ed before you make it an adverb.  

until -|- Until Now TV Inspired Lives 

usually -|- It's adverbs as usual, just add an –ly.